Download PCAN-PC/104-Power User Manual

PCAN-PC/104-Power
Switching Power Supply 5V/5A with
PC/104 Profile
User Manual
PCAN-PC/104-Power – User Manual
Products taken into account
Product Name
Model
Item Number
PCAN-PC/104-Power
IPEH-002070
PCAN-PC/104-Power Digi
Digital PC interface
IPEH-002071
PCAN-PC/104-Power II
Extended input voltage range
IPEH-002072
PCAN-PC/104 Power II Digi
Extended input voltage range,
digital PC interface
IPEH-002073
Last Update
March 13, 2006
New layout
Windows® and MS-DOS are registered trademarks of Microsoft Corporation in the
United States and other countries.
All other product names mentioned herein may be the trademarks or registered
trademarks of their respective companies. Furthermore, "™" and "®" are not
mentioned in each case in this manual.
© 2006 PEAK-System Technik GmbH
PEAK-System Technik GmbH
Otto-Röhm-Straße 69
D-64293 Darmstadt, Germany
Phone: +49 (0)6151-8173-20
Fax: +49 (0)6151-8173-29
www.peak-system.com
[email protected]
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PCAN-PC/104-Power – User Manual
Contents
1
1.1
1.2
2
2.1
Introduction
4
Properties at a Glance
Scope of Supply
Technical Description
4
4
5
Digi Version
8
3
Switching Options at Operation with Switch
10
4
Temperature-dependent Fan Control
11
5
Software
12
5.1
Example of a C routine for ANSI C
12
Appendix A
Jumper
15
Appendix B
Pin Assignment of the PC/104 Connector 16
Appendix C
Various Voltage Curves
3
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PCAN-PC/104-Power – User Manual
1
Introduction
The power supply was designed for use in PC/104 computer
systems. Possible fields of use are motor vehicles or SPS systems
with 24 Volts. The power supply is set up as step-down switching
regulator with the component LT1074 by Linear Technology. Further
options of the power supply are a temperature-dependent fan
regulation, a start and stop logic, and six digital inputs. These
options are offered separately.
1.1
Properties at a Glance
PC/104 switching power supply with max. 5 A output current at
5 V output voltage
Range of input voltage: 9 to 35 V (up to 55 V with type II)
Integrated protective circuit at faulty output voltage
Integrated, temperature-dependent PWM output for fan
connection
Two start modes
Switch-off control by software possible (only Digi version)
Temperature control and six digital inputs (only Digi version)
1.2
Scope of Supply
The scope of supply normally consists of the following parts:
Switching power supply PCAN-PC/104-Power
User manual
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PCAN-PC/104-Power – User Manual
2
Technical Description
The circuit's main function is the generation of a 5 Volt output with
high precission. The circuit is designed as step-down switching
regulator. For this task the component LT1074 by Linear Technology
is used (http://www.linear.com). This chip produces a typical
maximum output current of 6.5 Ampere. You can find further
information in the corresponding data sheet realeased by the
manufacturer.
The input voltage of the circuit may lie in the range of 9 to 35 Volts.
The lower limit is cause of the minimum input voltage of the
switching regulator and the voltage drop over the electronic switch.
If the power supply is used without switching option, a minimum
input voltage of 8 Volts can be reached. When operating the power
supply below this limit, make sure that there aren't any high
amplitude load alterations, because transient responses of up to
6 Volts can occur (about 1 ms duration).
For protection against destruction of the connected hardware a
power transient protection has been integrated that shorts the
input circuit at about 6 Volts at the output and therefore burns the
fuse. A slow-blow fuse (5 Ampere) with soldered connection is
used.
For stable operation the switching controller requires a minimum
load of 30 Ohm. If this load value is exceeded, the switching
controller doesn't generate a proper switching pulse, however, this
has no influence on the output voltage.
The switching controller has a maximum power dissipation of
about 8 Watts. This value is reached at full load and small input
voltage. This requires a sufficient cooling of the board. The
temperature-dependent fan regulation may be useful for this task.
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PCAN-PC/104-Power – User Manual
In the following block diagram you can find the solder jumper Vin
(JP1). With this switch the input of the switching controller is
specified. The power supply is operated either by applying an input
voltage or with an electronic switch. For direct operation a
connection from the left to the mid pad must be prepared. The label
"perm" (for permanent) is printed below these two pads. If the
switching option shall be used, the solder bridge must connect the
mid and the right pad (label "SW").
The block diagram shows the function units for a completely
equipped power supply. Details about special blocks are described
in the following chapters.
Figure 1: Block diagram of the switching power supply
In Appendix C you can find four oscilloscope patterns of the output
voltage. They show the voltage increase after powering on with
loads of 18 Ohm and 1 Ohm, and the behaviour at load alteration
between 18 and 1 Ohm. In Appendix B you can find the standardized pin assignment of the PC/104 bus connector (A1 to D19).
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PCAN-PC/104-Power – User Manual
Figure 2 shows the structure of the power supply. Connector J3 has
following pins:
Pin
Description
1
Input for "Permanent On" (e.g. terminal 15 in a
motor vehicle)
2
Output +5 Volt or Vin, to be set with jumper
OUT on the bottom side of the PCB
3
Pushbutton (switching on)
4
Negative power supply (Ground, e.g.
terminal 31 in a motor vehicle)
5
Positive power supply (+Vin, e.g. terminal 30
in a motor vehicle)
The lit LED indicates a generated output voltage of 5 Volts.
Figure 2: Structure of the power supply
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PCAN-PC/104-Power – User Manual
2.1
Digi Version
The Digi version of the power supply has a digital interface to the
PC. The connection is established via the ISA bus of the card. It
permits status monitoring of the power supply and the arbitrary use
of six digital inputs (pushbuttons, open-collector inputs, …).
Figure 3: Circuit of a digital input (here: In2)
In Figure 3 you can see the pull-up and pull-down resistors which
may either be equipped. They are implemented with SMD
technology having the footprint 1206 (bottom side).
The following table shows the labels, values, and the pins for the six
inputs. The values may be varied. The six digital inputs are routed
to J4.
1
2
3
4
5
6
Input
In 2
In 3
In 4
In 5
In 6
In 7
Pull-up resistor
(47 kOhm)
R18
R24
R27
R30
R33
R36
Series resistor
(10 kOhm)
R19
R25
R28
R31
R34
R37
Pull-down resistor
(47 kOhm)
R20
R26
R29
R32
R35
R38
Capacitor
(100 nF)
C12
C14
C15
C16
C17
C18
Pin at J4
Pins 7 and 8 are connected to Ground, pins 9 and 10 are connected
to 5 Volt. The 5 Volt output at J4 may be loaded with up to 500 mA
and is not fused.
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PCAN-PC/104-Power – User Manual
The status monitor implements two parameters: the occurrence of
"Permanent On" and an overtemperature signal (see also chapter 4
Temperature-dependent Fan Control). The information is read out
by an 8-bit value related to the set-up base address. The terminal
"Permanent On" permits switching on the power supply with an
external voltage (e.g. terminal 15 in a motor vehicle). Bit 0 follows
the corresponding level. Overtemperature (Tover) is low-active, e.g.
this bit is set to 1 in normal state. This results in the following bit
pattern:
In 7
In 6
In 5
In 4
In 3
In 4
Tover
Perm.
On
MSB
LSB
When using pull-up resistors, and neither the signals for
overtemperature nor an external switch-on voltage, then the return
value is 0xFE when reading from the address.
The input current consumption of the digital interface is about
10 mA at 5 Volt.
The base address is set-up with solder jumpers BA0 to BA4. The
address lies in the range of 0x100 to 0x3E0. It is set by the address
lines A5 to A9. Appendix A shows the corresponding jumper
scheme.
Note: The solder jumpers must be set before using the power
supply.
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PCAN-PC/104-Power – User Manual
3
Switching Options at
Operation with Switch
When using the electronic switch (JP1 set to SW), there are two
possibilities for activating the power supply. Those are "Permanent
On" (J3, pin 1) or a pushbutton. The option "Permanent On" is
intended for use in a motor vehicle (control with terminal 15,
ignition). The voltage for activating the power supply lies in the
range of 8 to 30 Volt. The status of the pin "Permanent On" is
reflected in bit 0 of the 8-bit value. When the voltage "Permanent
On" is switched off, the power supply is not deactivated
immediately. The running application must poll the status and
generate an active switch-off. The advantage of this procedure is
the defined shut-down of the application.
The second possibility for activation is a pushbutton against
ground. This pushbutton is connected to pin 3 of J3. Actuating the
pushbutton activates the power supply with latching. The switching
level lies at R_Taster < 6 kOhm against ground.
A switch-off is done by writing an arbitrary value to the defined
base address.
Note: When developing the application, make sure that writing
to the base address only occurs for switch-off.
In Figure 2 you can see a solder jumper left to the fan connector
labeled "Off". By opening the jumper the switch-off of the power
supply can be omitted. For example, this is needed during an
installation of Windows, since during hardware detection the power
supply would switch off.
Caused by the switch option is a non-operate current of the power
supply of about 0.1 mA (dependent on the input voltage).
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PCAN-PC/104-Power – User Manual
4
Temperature-dependent Fan
Control
The power supply has an option for temperature-dependent fan
control. Controlling is done with PWM of the switch in the fan circuit
(see Figure 1: Block diagram of the switching power supply). You
can use DC fans with a maximum current consumption of 200 mA.
The operating voltage of the fan depends on the input voltage of the
power supply. A so-called fan resistor compensates occuring
voltage offsets. The value is calculated as follows:
R_fan = (Vin – V_fan) / I_fan
The power rating of the resistor is:
P_v = I_fan² x R_fan
At delivery the power supply is equipped with a wire jumper (R_fan
= 0 Ohm). The temperature acquisition is done with an NTC
thermistor. Two points are dedicated for acquisition, however, they
cannot be used simultaneously. The first point lies directly on heat
sink of the power supply, labeled with NTC. The second possibility
is an external NTC thermistor that can be attached to the connector
NTC next to the fan connector (J5, FAN). If an external NTC
thermistor shall be used you must open the solder jumper beneath
the on-board NTC. The equipped NTC thermistor has a nominal
resistance of 47 kOhm. With this value the fan starts to turn at about
33 °C (91 °F), a PWM keying of 100 % is reached at about 60 °C
(140 °F). If the value of the NTC thermistor is 33 kOhm, the starting
temperature lies at about 27 °C (81 °F), 100 % PWM keying is
reached at about 45 °C (113 °F). Adaption to specific temperature
values may be achieved by varying the NTC thermistor's value.
A reached 100-percent keying ratio is indicated by the status change
of bit 1 (Tover) of the readable byte value to Low (low-active).
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PCAN-PC/104-Power – User Manual
5
Software
To use the optional functions (six digital inputs, switching logic,
temperature control) you need a software for reading and writing of
port addresses. By reading the dedicated port adresses you can
access the states of the digital inputs, the level of the switch
voltage, and the temperature control.
5.1
Example of a C routine for ANSI C
Please refer to the compiler's manual to get information about the
commands for port I/O.
Note: For port outputs under DOS you usually use the address
as first parameter and the output value as second parameter. C
compilers for linux handle this vice versa.
#define PC104_POWER_BASE
0x360
unsigned int Get_PC104_DIG_1( )
{
unsigned int ret;
/* Read base address and test for BIT 0 */
ret = (unsigned int) (_inpb(PC104_POWER_BASE)&0x01)
return ret;
}
Under windows you can use the function library PC104Pow.DLL.
You can retrieve it from our homepage (http://www.peaksystem.com).
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PCAN-PC/104-Power – User Manual
//
Set Base Adress (must be the first call to the
//
DLL to init the Interface)
void __stdcall Set_PowBase(unsigned short port);
//
Get Base Adress (must be set first with
//
SetBase Adress)
unsigned short __stdcall Get_PowBase();
//
Get_PP()
// Status of Digital Port Permanent Power
bool __stdcall Get_PP();
//
Get_Tover()
// Status of Digital Port Temprature Control
bool __stdcall Get_Tover();
//
Power_ShutDown – be carefull to use this
//
function !! System will not be shut
//
down Windows Operating System !!
void __stdcall Power_ShutDown();
//
Get_DI_1()
// Status of Digital Port 1
bool __stdcall Get_DI_1();
//
Get_DI_2()
// Status of Digital Port 2
bool __stdcall Get_DI_2();
//
Get_DI_3()
// Status of Digital Port 3
bool __stdcall Get_DI_3();
//
Get_DI_4()
// Status of Digital Port 4
bool __stdcall Get_DI_4();
//
Get_DI_5()
// Status of Digital Port 5
bool __stdcall Get_DI_5();
//
Get_DI_6()
// Status of Digital Port 6
bool __stdcall Get_DI_6();
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PCAN-PC/104-Power – User Manual
Note: Operating systems based on Windows NT technology do
not allow a direct port access. A needed device driver is
available on demand.
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PCAN-PC/104-Power – User Manual
Appendix A
Jumper
The table shows the jumper scheme. Jumpers marked with X must
be closed to gain the desired base address. Besides the base
addresses listed here any other in the range of 0x100 to 0x3E0 with
a step width of 0x20 is possible. BA0 determines the value for
address line A5, BA4 for A9. Address line A7 is permanently low.
With an open jumper the corresponding address line is retrieved for
High, with a closed jumper for Low. Address lines A2 to A4 are
always referenced to Low. A0 and A1 are without significance for
reading the byte value, however, for switching off the power supply
the addresses A0 and A1 must be Low.
ADR
BA0
Address A5
BA1
Address A6
BA3
Address A8
BA4
Address A9
0x100
X
X
-
X
0x120
-
X
-
X
0x140
X
-
-
X
X
0x160
-
-
-
0x200
X
X
X
-
0x220
-
X
X
-
0x240
X
-
X
-
0x260
-
-
X
0x300
X
X
-
-
0x320
-
X
-
-
0x340
X
-
-
-
0x360
-
-
-
-
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PCAN-PC/104-Power – User Manual
Appendix B
Pin Assignment of
the PC/104
Connector
The used assignment corresponds to the standard for PC/104 ISA
connectors. See also http://www.pc104.org.
Pin
Row A
Row B
Row C
0
-
-
GND
GND
1
IOCHCK
GND
SBHE
MEMCS16
2
D7
RSTDRV
LA23
IOCS16
3
D&
+5V
LA22
IRQ10
4
D5
IRQ9
LS21
IRQ11
5
D4
-5V
LS20
IRQ12
6
D3
DRQ2
LS19
IRQ15
7
D2
-12V
LA18
IRQ14
8
D1
ENDXFR
LA17
DACK0
9
D0
+12V
MEMR
DRQ0
10
IOCHRDY
GND/KEY
MEMW
DACK5
11
AEN
SMEMW
SD8
DRQ5
12
A19
SMEMR
SD9
DACK6
13
A18
IOW
SD10
DRQ6
14
A17
IOR
SD11
DACK7
15
A16
DACK3
SD12
DRQ7
16
A15
DRQ3
SD13
+5V
17
A14
DACK1
SD14
MASTER
18
A13
DRQ1
SD15
GND
19
A12
REFRESH
GND/KEY
GND
20
A11
SYSCLK
21
A10
IRQ7
22
A9
IRQ6
23
A8
IRQ5
24
A7
IRQ4
16
Row D
PCAN-PC/104-Power – User Manual
Pin
Row A
Row B
25
A6
IRQ3
26
A5
DACK2
27
A4
TC
28
A3
BALE
29
A2
+5V
30
A1
OSC
31
A0
GND
32
GND
GND
17
Row C
Row D
PCAN-PC/104-Power – User Manual
Appendix C Various Voltage
Curves
The following curves show the behavior during switch-on and load
alterations. The behavior at switch-on has been documented for two
load conditions: a start with a load of 1 Ohm and 18 Ohm. The two
other curves show the load alteration from 18 Ohm to 1 Ohm and
from 1 Ohm to 18 Ohm. The used loads had pure omic resistance.
Continued on next page
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PCAN-PC/104-Power – User Manual
Figure 4: Diagram for voltage increase at 1 Ohm load
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PCAN-PC/104-Power – User Manual
Figure 5: Diagram for voltage increase at 8 Ohm load
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PCAN-PC/104-Power – User Manual
Figure 6: Diagram for load alteration from 18 Ohm to 1 Ohm
21
PCAN-PC/104-Power – User Manual
Figure 7: Diagram for load alteration from 1 Ohm to 18 Ohm
22